Statement Of Cash Flows [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||
| Profit (loss) |
276,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
276,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
101,000,000
GBP
|
–
GBP
|
–
GBP
|
101,000,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||
| Adjustments for decrease (increase) in inventories |
13 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
123,000,000
GBP
|
— |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
632,000,000
GBP
|
— |
| Adjustments for provisions |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
25,000,000
GBP
|
— |
| Adjustments for share-based payments |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
8,000,000
GBP
|
— |
| Adjustments for fair value losses (gains) |
22,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
— |
| Adjustments for losses (gains) on disposal of non-current assets |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities |
75,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
107,000,000
GBP
|
— |
| Cash flows from (used in) operating activities |
291,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
605,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities |
187,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
160,000,000
GBP
|
— |
| Other cash receipts from sales of interests in joint ventures, classified as investing activities |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities |
253,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
358,000,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities |
63,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
95,000,000
GBP
|
— |
| Proceeds from sales of other long-term assets, classified as investing activities |
8,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— |
| Proceeds from government grants, classified as investing activities |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
| Interest received, classified as investing activities |
28,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
32,000,000
GBP
|
— |
| Cash flows from (used in) investing activities |
101,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
260,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||
| Payments to acquire or redeem entity's shares |
45,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
155,000,000
GBP
|
— |
| Proceeds from borrowings, classified as financing activities |
672,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities |
281,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
140,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— |
| Interest paid, classified as financing activities |
94,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
111,000,000
GBP
|
— |
| Cash flows from (used in) financing activities |
97,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
550,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
287,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
205,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
6,000,000
GBP
|
— |
| Cash and cash equivalents | — |
650,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
391,000,000
GBP
|